Add backers doc

BACKERS.md

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+<h1 align="center">Sponsors &amp; Backers</h1>
+
+UNPKG is an open source project licensed under the AGPL. Ongoing development of UNPKG is made possible thanks to the support of our sponsors and backers.
+
+If you'd like to support the project, please consider <a title="Support UNPKG on Patreon" href="https://www.patreon.com/unpkg">becoming a backer or sponsor on Patreon</a>.
+
+<p>&nbsp;</p>
+
+<h2 align="center">Key Sponsors</h2>
+
+<p align="center">
+ <a title="Angular" href="https://angular.io">
+ <img alt="Angular Logo" src="./sponsors/angular.png" />
+ </a>
+</p>
+
+<p align="center"><a title="Become a Key Sponsor on Patreon" href="https://www.patreon.com/unpkg">Become a Key Sponsor</a></p>
+
+<p>&nbsp;</p>
+
+<h2 align="center">Star Sponsors</h2>
+
+<p align="center"><a title="Become a Star Sponsor on Patreon" href="https://www.patreon.com/unpkg">Become a Star Sponsor</a></p>
+
+<p>&nbsp;</p>
+
+<h2 align="center">Sponsors</h2>
+
+<p align="center"><a title="Become a Sponsor on Patreon" href="https://www.patreon.com/unpkg">Become a Sponsor</a></p>
+
+<p>&nbsp;</p>
+
+<h2 align="center">Backers</h2>
+
+<p align="center"><a title="Become a Backer on Patreon" href="https://www.patreon.com/unpkg">Become a Backer</a></p>